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There is a difference on the "cool down" period between the operation of a 2000 Cat -9 and a Cummins 2012 450 ISL. Obviously the engineering is a decade apart due to technological advances created by environmental concerns. I for one am following the manufactures directions and have for the three years I've owned and serviced my 450 ISL. No issues at all. Great power plant.

The only people that leave their DPs idling all the time have a "Corporate Fuel Card" in their possession.

You will see this at truck stops too. The independent operators are all shut down for the night. All the corporate chain drivers leave their rigs idling while they sleep!

Yea that's not true about the Corporate Fuel Cards. I don't have one but at times would idle my MH when fueling. I pay for my own fuel as do all other MH owners. I just asked the question because I noticed that some do and some don't. I did not read that part of the manual for my 2014 6.7 liter ISB Cummins. Seems like there are opinions on both sides. Thanks for all the input, I will probably shut mine down after a minute or two unless I need to pull up to fill my DEF towards the rear of my unit.

So how many have noticed the absence of the "turn off engine while fueling" stickers on the truck side diesel pumps. I see them all the time on the multi fuel pumps, but I dont recall ever seeing one on the truck side diesel only pumps.

So how many have noticed the absence of the "turn off engine while fueling" stickers on the truck side diesel pumps. I see them all the time on the multi fuel pumps, but I dont recall ever seeing one on the truck side diesel only pumps.

Big truck Islands.......I noticed........posted on all the gas islands
Federal and state "Idle" signs here and there

Left Indy this Am and headed south- stopped at Flying J Temp (28deg) Idled while fueling- Also left the furnace running- took 20 min in and out.
Bottom line If the weathers cold it idles, If its Hot out The Genny is running!

It is evident - there is no clear cut answer as know one is reporting ruining there engine because of idling for a extra minute or two. My guess - it doesn't matter. Idling the length of a fuel fill probably doesn't affect the motor. Idling all night days on end might - but a simple 10 minute fuel up. My opinion - no problem. I leave mine running - more for proper cool down and fear of not starting at a fuel island. Why chance it. Mine has always started - but one day...may not. If it isn't going to start - I hope it is in a campsite were I can deal with it on my own terms....I don't gamble in Vegas either because I am to damn conservative and like the odds in my favor. Less start ups - less chance for failure :-)

OK , now a twist in this thread..........cruising down the interstate, then alls you see is brake light's You set the brakes, Dead stop, traffic for as far as you can see..........do the "Shutdown" folks shut their engine's down 10 minutes passes..........creep 200' then stoped again...........1/2 hour passes , nothing...........Ever been hereWhat do you do?On, off, on , off? ON..........?Do you do what the "Bible" (manual) says? and if not, why? You have been idling for 20 minutes now..........

OK , now a twist in this thread..........cruising down the interstate, then alls you see is brake light's You set the brakes, Dead stop, traffic for as far as you can see..........do the "Shutdown" folks shut their engine's down 10 minutes passes..........creep 200' then stoped again...........1/2 hour passes , nothing...........Ever been hereWhat do you do?On, off, on , off? ON..........?Do you do what the "Bible" (manual) says? and if not, why? You have been idling for 20 minutes now..........

That is "situation dependent" to me. I do know that if I end up stopped in traffic more than 3-5 minutes and if I don't shut down, I will go to fast idle (DEF engine). Mike Cody told us at Camp Freightliner that the Cummins is sensitive to long periods of idle (again, talking DEF) and will throw an engine code, and that fast idle make the engine think it's going down the road instead of idling. That appears to be backed up in my Cummins manual which states never to idle longer than necessary, and that excessive idling will throw codes and/or cause problems. There is also supposedly something in the ECM that tracks idle time, but I don't have any first hand knowledge of that.

OK , now a twist in this thread..........cruising down the interstate, then alls you see is brake light's You set the brakes, Dead stop, traffic for as far as you can see..........do the "Shutdown" folks shut their engine's down 10 minutes passes..........creep 200' then stoped again...........1/2 hour passes , nothing...........Ever been hereWhat do you do?On, off, on , off? ON..........?Do you do what the "Bible" (manual) says? and if not, why? You have been idling for 20 minutes now..........

83 posts to get to some "useful" information...well done palehorse.....I cant help but wonder how some of my fellow RVs even manage to get out of the drive way--given all the "warning" and "precautions" associated with our rigs--safe travels road warriors...